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Despite the headway, the negotiation is faced with challenges and uncertainties. No matter what happens in the end, China will defend its national dignity and fundamental interests.

Despite profound changes in the international situation and increasing instabilities and uncertainties, China's position in safeguarding the Iranian nuclear deal has not changed, neither has its commitment to developing China-Iran relations, Li said.

This could help reduce annual emissions of dust by 6,494 tonnes and cut annual emissions of carbon dioxide and sulfur dioxide, said Chen.

The sea-rail transport services at the port handled more than 600,000 standard containers in 2018, a year-on-year increase of over 50 percent.

Its GDP expanded 6 percent year on year to 2.04 trillion yuan (299 billion U.S. dollars) in 2018, the municipal statistics bureau announced Tuesday.